Countries have implicit cultural beliefs and practices about early childhood education which they tend to undervalue and which, as a result, are endangered. The Preschool in Three Cultures Revisited study includes examples of such implicit cultural beliefs and practices in Chinese, Japanese, and US preschools. The paper argues that early childhood practitioners, policy makers, and scholars should give greater value to these cultural beliefs and practices and think of them as national treasures and as endangered educational ecology which it is our responsibility to protect and pass on to the next generation.